Drill holder



DRILL HOLDER Filed June 24, 1942Y z 'lill/[111mm Patented Sept. 5, 1944U N I TE D L STATES PATE-N Tv'. O'F'Fl C E.

DRILL HOLDER Vincent A. 4Sheskie, Farmingdale, N. vY., assignor.v t-o`Farmingdale'Aircraftsmen Manufactur ing Corporation, Farmingdale, N. Y.

Application June 24, 1.942, SerialNo. 448,281

. 3 Claims;

This invention relates ,to a drill. holder-and it is an object of theinvention to providea device i of this kind including a handle membercarrying a head rotatably supportingfa collet; and wherein means.`areprovided .for effectively .lubricating .the 5 collet .toassurekeeping ,the head1cool at -alltimesl-v Itis alsoan-object of.theinvention to .provi-de l a holder-of thiskind-including a colletadaptedto detachably holda drilliso-thatupon breakage of .thepdrill orfor; other reasons, such dri-ll .canil be readilyreplaced.y l

A .still further: object 'tot theinvention `is to provide. a holder of-this kind including a vcolletf* to receive a drill, said'colletLbeing-provided withk meanswto permitV the drill to Dbe selectivelyad--justed, whereby the length of the drill protruding from the collet maybe adjusted to the exact.r depth-of .the hole to be drilled, therebyavoiding. the,.danger of drilling'through and having th'e'.;

drilllbecome unmanagealole.A

An additional object of the invention'is toipro-e vide a holderofwthis'kindo a characterlwhiclr permits the drill to be setin a manner.to-cassure;v a trueI running hole, so that the hole .thatis drilled.;maintains a tolerance -ofznot more:than:.-1one-: thousandth of an inch.

A still further object of the invention-.is topro- .v vide.a holder ofthis-kind which .enables-tha: drilling of holes into small and otherwiseinacces sible spots;

The invention has foran `additionalobject to provide a holder of thiskind whichlprovides-foi the .vusetof` interchangeableicollets andwherein each of vsuch collets can abe" conveniently applied:

Figure/i is a detailed sectional View taken sub-Vv stantially on theline 4-4 of Figure 1.

Figure 5 is a sectionalfview taken longitudi nally through a secondcollet havinga bore of a A .diameter different from the bore of thecollet shown. in Figures -1 to 4, and l- Figure 6 is a fragmentaryelevational view, with a portionbroken away, illustratinga holderconstructedin accordance withanother embodiment r of the invention.`

is preferably ofmetal -andihasa majorportion.

or removed without. necessitating displacement'- of- "35 the :drill withrespect -ftothe colletif The vinvention lconsists in th'edetailsr` ofcon-W struction' and .in the combination .and'arrange mentfof the`several parts of my :drill `holder fwhe'rebylfcertain importantadvantages-are :at' tained, as will be hereinafter more fullyisetforth.`

In"`ordei that my invention-may bei better'une" derstood, I will nowproceedltoidescribe thesame j 2 of its periphery knurled.

Forced intoione endportion of the bore 3 'of'- the handle member .Iisfan..V elongated stem 4 radiatingffrom abearingphead 5, said stem-.4and Y ,headY 5 beingpreferably.integral andrmade vof phosphor-bronze.,.Y

The. bore 6 of the head-.5 is dispased axially I at right.. angles tov.the `axis ofthe stem A and` said stem 4 has disposed axiallytherethrough a lubricatingportl, one end of which-opens direct" intothe. bore E of .thehead 5 and .the other end beingin open communicationwith 4the lbore 3 of the handle member .I I

The bore 3 of theihandle member ofV theappliedstemA provides a reservoirfora suitable lubricatinggrease or material, and-therouter end ofthebore 3 has snugly-.tted therein Y a sleeve 8 into which threads vfromwithout a" fitting 9 for .coupling with a suitable -grease gun or thevlike .whereby lubricant; maybe forced up.V through thehandlemember. Iand through the y port 'I intothebore of thefhead 5 to lubricate y with`vreference to the accompanying drawing,

the shaft Il) .of the appliedfcollet. Y

The shaft lis ota length substantially coextensive in length with thelengthofthe `bore 6 and the head. Il ofthe collet has an inner-'atv faceI2 surrounding-the 'shaft Il] for contact with e an endof.thebearinghead 5 toV limit the extent. of insertion of theshaft:|0intothe bore '6 of the f head 5.

The shaft;l I0 and thefhead'l II-of` the'acollet C have disposed axiallytherethroughfa bore M Yin which is .snuglygand-freely inserted the'rearend* portion of a drill If5ii` This "drilll5'.isjadaiotedto` have itsforward' or Workingend-portionprojected z. outwardlyin advance of thehead I I ofthe collet C in accordance with the depth of the hole to bedrilled and said drill I5 is effectively held or locked in its selectedendwise adjusted position by theAllen'nuts I6 threading radially throughI outwardly the head II of the collet C for binding contact with theinserted portion of the drill I5.

The end portion of the bore I4 of the collet C remote from the head isenlarged, as at I1, and threading into such enlarged portion II is anaxial extension I8 carried by the inner face 20 of a tail-piece I9. Thisinner face 20 of the tail-piece is substantially flat and surrounds theextension I8 and has close contact with the adjacent or free end of theshaft I of the collet C. This tail-piece I9 is fixed to an end portionofa flexible shaft 2| for rotation therewith. This flexible shaft ZI isadapted to be suitably coupled to the chuck of a drill motor of anypreferred type and which in itself forms no part of the presentinvention.

The extension I8 has disposed axially therethrough a bore 22 which iscontinued for a considerable distance within'the tail-piece I9 and, asis particularly illustrated in Figure 3 of the drawing, this bore 22 isof a material diameter so that the inserted end portions of drills ofdifferent sizes may be readily received therein in order to allow forthe desired endwise adjustment of the drill I5.

In practice, it is the purpose to furnish with each of the handlemembers I a series of collets each of which has a bore therethrough inaccordance with a particular size of drill. In Figure of the drawing isillustrated a collet C constructed substantially the same as the colletC except that the bore 23 thereof is of a diameter less than thediameter of thev bore I4 of the collet C. Also, in this form, the Allenscrews are set in the shaft portion Iand will therefore be housed inhead 5.

It is intended that witheach handle member I a set of at least fivecollets be supplied for use in connection with drills of different sizesand it is believed to be obvious that the diameter of the bore 22 of thetail-piece I9 is large enough to receive the inserted end portions ofany one of such different drills, thus making it necessary only to use asingle tail-piece I 9.

In the embodiment of the invention as illustrated in Figure 6, thegeneral construction is the same as comprised in the rst embodimentexcept that the stem 24 of the bearing head 25 is angularly related withrespect to the axis of the head 5 to permit the use of the holder inplaces which would not otherwiseY be accessible by the tool as comprisedin the first embodiment.

In View of the foregoing it is believed to be obvious that the holder isof a type employing the use of interchangeable collets C and that inconnection with each of such collets C the exl tended length of theapplied drill I5 can be easily adjusted by proper manipulation of theAllen screws I6, such adjustment bein-g facilitated by the bore I8 inthe tail-piece I9.

The head II of the collet C and the tail-piece I9 are provided withmilled flats 26 so that the assembly of the collet and tail-piece onewith respect to the other and with respect to the bearing head 5 may befacilitated by the use of wrenches. Such flats are also shown in thecollet C', at 26. It is to be further and particularly pointed out thatthe major radius of the head I I of the collet C and of the tail-pieceI9 is less than the mean radius of the bearing head 5, so

that the periphery of the head II and of the tail-piece I9 during aworking operation will not touch the work and thus eliminate the damagewhich would otherwise occur.

It will also be noted that the Allen screws I'B do not protrude into thebore I4 of the collet C but merely touch the applied drill I5 and holdit from slipping in or out. This assures trueness in the hole that isAbeing drilled.

It is also to be emphasized that the bore I4 ofthe collet C is of theexact diameter as the end portion of the drill inserted therethrough.This further insures trueness in the hole that is being drilled onaccount of the elimination of any over-size in the bore I4 with respectto the drill I5.

From the foregoing description it is thought to be obvious that a drillholder constructed in accordance with my invention is particularly welladapted for use by reason of the convenience and facility with which itmay be assembled and operated.

What lI claim is:

1 A drill holder comprising a tubularl handle member, a bearing headhaving a stem fitting within an end portion of the tubular handle, saidbearing head having a cylindrical opening therethrough, the stem of thebearing head having an axially disposed port affording communicationbetween the interior of the tubular handle and with the bore of thebearing head, said tubular handle constituting a reservoir forlubricant, a collet having a shaft tting between the bore of the bearinghead, means for holding a drill to the collet, and means coupled to theouter end portion of the shaft of the collet for rotating the collet.

2. A drill holder comprising a bearing head having a cylindrical bore, acollet including a head and shaft, the shaft rotatably extending withinthe bore of the bearing head, said head and shaftl of the collet havinga bore extending entirely and axially therethrough to freely receive anend portion of a drill, and a tail-piece engaged with the end portion ofthe shaft of the collet remote from the head of the collet, saidtail-piece having a bore with which the bore of the collet communicates,said bore ofthe tail-piece being also adapted to receive the insertedend portion of the drill, said tail-piece providing means for couplingthe shaft of the collet to a source of power for rotating the collet.

3. A drill holder, comprising a tubular handle member, a bearing headhaving a stem fitting within an end of the tubular handle, a collethaving a reduced shaft forming an annular bearing shoulder, said shaftbeing rotatably fitted insaid bearing head and having the shoulderrotatably engaging the head, the shaft at its free end having aninteriorly threaded socket, a tail-piece having a threaded stem adaptedfor engagement in said socket and having a shoulder at the inner end ofthis stem for turning engagement against the side of the bearing headopposite the first shoulder, means coupled with said tail piecefacilitating the application of rotary power thereto and to the collet,and said collet having an axial bore for the reception of a drill.

VINCENT A. SHESKIER

